@coreyspowell One last thing: the incoming #TCrB nova might be a type Ia event. It sits 2500 light years from here and will present as a new "guest star" or might even cast a second shadow during the day if the Chandrasekar limit is hit. I guess you especially will enjoy those few days of sky gazing.
While the spectrum of #TCrB is currently acting up - https://skyweek.wordpress.com/2025/02/16/allgemeines-live-blog-ab-dem-16-februar-2025/#Feb16 - this probably does *not* mean that the next big eruption of the recurrent nova is imminent: https://forums.aavso.org/t/observing-campaigns-875-monitoring-t-crb/946/60 and https://www.facebook.com/david.iadevaia/posts/pfbid026ZgWvaFhPjkcfX2EtCgfvRAVR7p6wqgZ3SA5QmiX1W2eua22zDYTTHFzpbNpC87Zl
A funny way to 'monitor' #TCrB: the view of Cam 2 of the #AllSky7 system https://allsky7.net/index.html?&station=AMS216#liveview on the roof of a school in #Bochum, Germany - the limiting magnitude is a bit better than 2 (in the currently moonlit sky), so if the star blows and reaches 2 mag. it would actually show up as another point of light similar and close to Gemma.
Les raies d'émission dans le spectre de #TCrB sont de plus en plus marquées, indiquant une augmentation de l'accretion dans le disque qui entoure la naine blanche. Bientôt le grand soir ? Peut-être...
Actuellement invisible à l'oeil, cette étoile le deviendra mais restera faible lors de la nova.
@skyglowberlin I’ve had my eye on #TCrB since last year. Exciting to see some reported changes in the spectral signatures of accretion. Looking forward to the eruption.
Fingers crossed for clear skies for all.
TCrB, TCrB, TCrB!
Too bad it's cloudy...
Tautenburger Astronomen melden "signifikante Änderungen im Spektrum von #TCrB. Die Emissionslinien im Spektrum sind sprunghaft angestiegen, was auf eine stark erhöhte Akkretionsrate hindeutet. Des Weiteren sind nun Emissionslinien zu sehen, die nur bei einer Temperatur von mindestens 40000 K entstehen können. [...] Dies könnten erste Anzeichen sein, dass die Nova in Kürze ausbrechen wird": https://www.tls-tautenburg.de/de/news/tautenburger-wissenschaftler-beobachten-auffaellige-veraenderung-im-spektrum-der-wiederkehrenden-nova-t-crb-und-bleiben-wachsam -> https://www.facebook.com/Cunolanghaar/posts/pfbid02SyQfQMGUdbYwiZim6ZETGu3Lhhcs9d7BvfYHkmwpdPoiRrHpw6tW7kxK7Pnv111El und https://www.astronomerstelegram.org/?read=17030
Pre-Outburst Observations of #TCrB with a Smart Telescope: https://iopscience.iop.org/article/10.3847/2515-5172/ad9fea -> "From 2024 April 2 to November 7, we obtained, through two Seestar S50 smart-telescopes, 8060 unfiltered photometric points. It was thus possible to calculate the orbital period of the binary system found to be 226.1 ± 3.8 days, lower than the officially recognized 227.5687 ± 0.0099 days but within the error bar. No outbursts were observed during this observation period."
Turns out I can still catch #TCrB from the attic in the early evening!
Il y a de nouvelles observations : c'est effectivement une fausse alerte. La magnitude est toujours aux alentours de 10 donc toujours pas de #nova.
Le site https://spaceweather.com/ indique que la nova T CrB à actuellement une magnitude de 5,9. Cela pourrait vouloir dire que l'étoile commence une éruption. Le site de l'AAVSO montre toutefois que ce chiffre est basé sur une seule observation et en visuel donc le risque de fausse alerte est important. Les précédentes obs apparaissent avec une mag. normale mais datent de ~16h.
Si vous avez la possibilité c'est le bon moment pour vérifier (chez moi c'est 
).
https://theskylive.com/sky/stars/hr-5958-star
Waiting for the Next Outburst
“Monitor the most recent measurements of #TCoronaeBorealis visual magnitude:
Magnitude 11.578 ± 0.007
#blazestar #CoronaBorealis #TCrB
#nova #binarystars #redgiant #whitedwarf #HD143454 #SAO84129
What to Do During the Eruption of T CrB
The next predicted eruption of T Corona Borealis (T CrB) is believed to be imminent. When the Blaze Star explodes, it will pay to be prepared.
AAVSO is here to help:
https://www.aavso.org/blog/what-do-during-eruption-t-crb
Dossier der Woche: Ein „neuer Stern“ am Himmel.
In den nächsten Tagen oder Wochen wird am Himmel eine Nova aufleuchten – die Explosion eines Weißen Zwergs im Sternbild „Nördliche Krone“. #Nova #TCrB #CoronaBorealis #Sternexplosion #WeißerZwerg #Astronomie
https://www.scinexx.de/dossier/ein-neuer-stern-am-himmel/
Vor etwa 3.000 Jahren entzündete sich der Wasserstoff eines Weißen Zwergs von der Masse unserer Sonne (T Coronae Borealis) der einen Roten Riesen umkreist.
Das Licht dieses Ereignisses erwartet uns irgendwann ab jetzt bis Ende des Jahres und wird mit bloßem Auge für etwa 1-3 Nächten als heller Punkt am Nachthimmel zu sehen sein.
@cosmos4u Referring to the paper seems that researchers see #TCrB flickering more like a normal variation causing deviations when analyzing #TCrB light curves. Perhaps some findings can be found afterwards. Anyway, it's interesting to amateur to follow #TCrB flickering activity during ongoing pre-eruption stage and then after primary eruption during secondary- and post-eruption states.
Here enclosed is a fresh graph of my last night observations, several flicker activities is again visible.
@cosmos4u
I have observed #TCrB around 30 nights during June&July each about 4 hours period with 22 second resolution. However, although there has been some possible findings of trends in my observations I have not actually analyzed those.
There are many research papers of these Cataclysmic Variables (CVs) published, and seems that in #TCrB there are brightness flickering even inside 1 minute. I have reported my observations to #AAVSO database, which researchers are using actively.
